<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片区域 -->
    <el-card>
      <!-- 警示框 -->
      <el-row>
        <el-col>
          <el-alert title="添加商品信息"
                    type="info"
                    center
                    show-icon
                    :closable="false"></el-alert>
        </el-col>
      </el-row>
      <!-- 步骤条 -->
      <el-steps :active="activeIndex - 0"
                align-center
                finish-status="success">
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- 标签栏 -->
      <el-form :model="addForm"
               :rules="addFormRules"
               ref="addFormRef"
               label-position="top">
        <el-tabs v-model="activeIndex"
                 :tab-position="'left'"
                 :before-leave="beforeTabLeave"
                 @tab-click="tabClicked">
          <el-tab-pane label="基本信息"
                       name="0">
            <el-form-item label="商品名称"
                          prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格"
                          prop="goods_price">
              <el-input v-model="addForm.goods_price"
                        type="number"
                        placeholder="0"></el-input>
            </el-form-item>
            <el-form-item label="商品重量"
                          prop="goods_weight">
              <el-input v-model="addForm.goods_weight"
                        type="number"
                        placeholder="0"></el-input>
            </el-form-item>
            <el-form-item label="商品数量"
                          prop="goods_number">
              <el-input v-model="addForm.goods_number"
                        type="number"
                        placeholder="0"></el-input>
            </el-form-item>
            <!-- 级联选择器 -->
            <el-form-item label="商品分类"
                          prop="goods_cat">
              <el-cascader v-model="addForm.goods_cat"
                           :options="cateList"
                           :props="cateKsys"
                           expand-trigger="hover"
                           @change="handleChange"
                           :clearable="true"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数"
                       name="1">
            <el-form-item :label="item.attr_name"
                          v-for="item in manyTableData"
                          :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="ck"
                             v-for="(ck,i) in item.attr_vals"
                             :key="i"
                             border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性"
                       name="2">
            <el-form-item :label="item.attr_name"
                          v-for="item in onlyTableData"
                          :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片"
                       name="3">
            <el-upload class="upload-demo"
                       :action="uploadURL"
                       :on-preview="handlePreview"
                       :on-remove="handleRemove"
                       :headers="headerObj"
                       :on-success="handleSuccess"
                       list-type="picture">
              <el-button size="small"
                         type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容"
                       name="4">
            <quill-editor v-model="addForm.goods_introduce">
            </quill-editor>
            <el-button type="primary"
                       class="addBtn"
                       @click="AddBtn">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 预览区域 -->
    <el-dialog title="图片预览"
               :visible.sync="PriceDialogVisible"
               width="50%">
      <img :src="previewPath"
           alt=""
           class="previewStyle">
    </el-dialog>
  </div>
</template>

<script>
// 导入lodash
import _ from 'lodash'

export default {
  data () {
    return {
      // 进度条默认展示索引
      activeIndex: '0',
      // 表单中的数据
      addForm: {
        goods_name: '',
        goods_price: '0',
        goods_weight: '0',
        goods_number: '0',
        goods_cat: [],
        pics: [],
        goods_introduce: '',
        attrs: []
      },
      //  效验规则
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请输入商品分类', trigger: 'blur' }]
      },
      // 商品分类列表
      cateList: [],
      cateKsys: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 动态参顺列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 上传路径
      uploadURL: 'http:// 127.0.0.1:8888/api/private/v1/upload',
      // 请求头
      headerObj: {
        Authorization:
          window.sessionStorage.getItem('token')
      },
      // 预览图片的路径
      previewPath: '',
      // 预览框的显示与隐藏
      PriceDialogVisible: false
    }
  },
  created () {
    this.getAddlist()
  },
  methods: {
    // 获取数据列表
    async getAddlist () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品')
      }
      this.cateList = res.data
    },
    // 级联选择器发生切换
    handleChange () {
      //  console.log(this.addForm.goods_cat);
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = ''
      }
    },
    // 阻止标签页跳转
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类!')
        return false
      }
    },
    // tab页签切换
    async tabClicked () {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) {
          return this.$message.error('动态数据获取失败')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
        //  console.log(this.manyTableData);
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) {
          return this.$message.error('静态数据获取失败')
        }
        this.onlyTableData = res.data
        //  console.log(this.onlyTableData);
      }
    },
    // 处理图片预览
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.PriceDialogVisible = true
    },
    // 处理移除图片
    handleRemove (file) {
      // file就是要移除图片的信息
      // 1.获取要删除图片的临时路径
      const filePath = file.response.data.tem_path
      // 2.在 pics 数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x =>
        x.pic === filePath
      )
      // 3.从 pics 数组中移除
      this.addForm.pics.splice(i, 1)
    },
    // 图片上传成功
    handleSuccess (response) {
      const picInfo = { pic: response.data.tmp_path }
      this.addForm.pics.push(picInfo)
    },
    // 添加按钮
    async AddBtn () {
      this.$refs.addFormRef.validate(valid => {
        if (!valid) return this.$message.error('请填写完整的表单信息')
      })
      // 深拷贝  addForm中的goods_cat指向级联选择器，级联选择器的goods_cat的值只能是对象格式
      // 所以要进行深拷贝  利用 lodash _
      const form = _.cloneDeep(this.addForm)
      form.goods_cat = form.goods_cat.join(',')
      // 添加时上传的属性中  attrs 只能包含{attr_id   attr_vals} 所以进行循环遍历
      // 处理动态参数
      this.manyTableData.forEach(item => {
        const newInfo = {
          attr_id: item.attr_id,
          attr_vals: item.attr_vals.join(' ')
        }
        this.addForm.attrs.push(newInfo)
      })
      // 处理静态属性
      this.onlyTableData.forEach(item => {
        const newInfo = {
          attr_id: item.attr_id,
          attr_vals: item.attr_vals
        }
        this.addForm.attrs.push(newInfo)
      })
      //  console.log(form);
      form.attrs = this.addForm.attrs
      //  console.log(form);
      const { data: res } = await this.$http.post('goods', form)
      if (res.meta.status !== 201) {
        return this.$message.error('添加商品失败')
      }
      this.$message.success('添加商品成功')
      this.$router.push('/goods')
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-alert {
  align-items: center;
}
.previewStyle {
  width: 100%;
}
.el-checkbox {
  margin-right: 10px;
}
.addBtn {
  margin-top: 15px;
}
</style>
